TwinTurbo.NET: Nissan 300ZX forum - Finally removed the second cylinder head today....
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Subject Finally removed the second cylinder head today....
     
Posted by WAGGZ on November 06, 2006 at 8:08 PM
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Message After over a week of breaking hex drivers, I managed to finally pop the PS head off tonight. Funny thing is, I tried a different(much cheaper) hex driver that I bought at an auto parts store this time and it worked just fine. The craftsman 10mm 3/8"Dr. hex driver went for about $10. The Powerbuilt one was about $2, and was obviously built heftier.
Anyway, I was noticing something about my engine that puzzled me. The two cylinder heads show different signs on the their exhaust valves. The DS head seems to be a little oily and all valves are dark in color. The PS head seems to be dryer and the exhaust valves are tan in color. Is the tan color normal?
VVV-- DS head --VVV

VVV-- PS head --VVV

I also noticed some streak marks inside of my cylinder walls. They are not even marks and all of the cylinders are showing these brown marks. Would this be a sign of bad rings?

     
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